Friction driving and speed-regulating device.



TTUHNEY.

PTENTED JULY 26, 190% Bf @ai C. L. WEIGHELT. FRIGTION DRIVNG AND SPEEDREGULATING DEVICE.

APPLICATION FILED APP... 1S. 1904.

NO MODEL WTNESSES:

v UNITED STATES Patented July 26, 1904.

IPATENT OEEICE.

CHARLES L. W EICHELT, OF PHILADELPHIA, PENNSYLVANIA.

SPECIFICATION forming part of Letters Patent No. 765,722, dated July 26,1904.

Application filed April 13, 1904:.

T o {ZZZ 'wh/)Tit 'ZZ mfc/y concern:

Be it known that I, CHARLES L. lVErcuuUr, a citizen of the UnitedStates, and a resident of the city and county of Philadelphia, State ofPennsylvania, have invented certain new and useful Improvements inFriction Driving and Speed-Regulating Devices, of which the following isa specification.

Myv invention relates to improvements in friction driving andspeed-regulating devices; and the object of my invention is to furnish adevice to be interposed between a source of power and a driven machine,being itself driven by the lirst and driving the second, which willcause the driven machine to rotate with a substantially uniform speedirrespective of the speed of the driving-wheel or other source of power.

My invention is applicable to and particularly useful in driving anignition dynamo for gas, gasolene, and oil engines in which a con* stantspeed of the armature is desirable, so that a spark of a uniform sizeand intensity may be at all times delivered irrespective of the speed ofthe engine or other source of power from which the armature is driven;but it will be understood that while my frictiongear is primarilyintended for use upon an ignition-dynamo I do not desire to confine itto this application, as it can be used wherever such an arrangementmight be found useful.

In the accompanying drawings, forming part of this specification, and inwhich similar letters of reference indicate similar parts throughout theseveral views, Figure l is a side elevation, partly in section, of asparking dynamo furnished with my friction driving and speed-regulatingdevice, the latter being shown in central sectional elevation; Fig. 2, afront elevation, enlarged, partly in section, of the regulating device,Fig. l; Fig. 3, a side elevation, partly in section, of the regulatingdevice, the section being at right angles to that lshown in Fig. l.

(t is the armature-shaft of the ignition-dynamo Z.

c is a hub fast upon shaft a; (Z, a pulley loosely carried by hub c; c,a plate carryinga hollow hub f.

g /1/ are plates upon the outside of plate c.

Z represents screws passing through plates Serial No. 202,907. (Nomodel.)

f/ /L and plate c and into the hub c. The holes in the plates g ZL,through which the screws v1 pass, are slightly larger than the diameterof the screws, so that they may have a movement as presently described.Upon the opposite ends of the plate f/ are bosses j, bored and threaded,and upon opposite ends of the plate /1/ are bosses 'f, bored andthreaded in an opposite direction from the threads in bosses y'.

Z in are angular levers, the {irst carried by a shaft a, the ends ofwhich are threaded in opposite directions, one end entering and beingcarried by a boss 7' on plate g, the other end entering and being'carried by a boss Z. on plate /i and the second carried by a similarshaft o, which enters and is carried by the bosses 7' Zi; upon theopposite ends of plates f/ ZL. The outer ends of levers Z m carry ballsor weights p, and their inner ends engage a sliding block 9', carried bythe hollow hub f of plate c, the hub being' slotted at a s, l, to permitthe -inner ends of levers Z m. te engage this block.

t is a spring' engaging the outer end of block fr; u, a screw-plugclosing the outer end of hub a 7 and forminga bearing for the outer endof spring t.

w, Figs. 2 and 3, are frictionfshoes, of liber, for instance, carried bythe outer ends of plates f/ Zt, adapted to engage the inner periphery ofthe outer end of pulley (Z.

fr; is an oil-space within hub c, and g/ a wick for carrying oil fromspace a' to the under side of pulley (IZ.

The operation of. the device is as follows: The pulley (Z is driven by abelt and engages the friction-shoes w, and through these shoes theplates f/ /t and the screws 'Z drive the hub c, which is fast to anddrives the d ynamo-shaft (t. This driving continues so long as thepredetermined revolutions of the shaft c are not exceeded. Should thespeed of the pulley Z exceed the desired speed of the shaft c, thecentrifugal force will act to throw the outer or weighted ends of leversZ m outward, and the rocking of the screws w, o, caused by the outwardmovement of the weighted ends of the levers, will cause the plates y /1/to be moved inward, so that the friction-shoes w will disengage er bearless tightly against the pulley (Z, thus permitting the pulley to turnwithout IOO driving the friction-shoes at the same speed as it itselfturns. The disengagement of the pulley Z and the friction-slices w willbe in proportionV to the difference between the actual speed of thepulley and the desired speed of the shaft. If the difference be butslight, the disengagement will be but partial-that is to say, the leverslm will move the friction-shoes but slightly inward, not entirely out ofcontact with the pulley CZ. If the difference in the speeds be verygreat, the shoes would be moved momentarily entirely out of contact withthe pulley. 1 aim, however, if possible to so proportion the speeds ofthe pulley and of the shaft a that an entire disengagement of thefriction-shoes and drivingpulley would occur as seldom as possible, forthe rengagement of these parts if com pletely separated would almostinevitably result in unequal speeds of the shaft a. By setting thescrew-plug fa. in or out the operative movements of the levers lm can beadjusted. If the spring be tightened, the levers will not respond tocentrifugal action so soon as they would were the spring loosened.

Usually the speed of the driving member (l of the device varies withincomparatively narrow limits, and by experiment the spring t can be soset as to cause the levers l m to operate the friction-shoes sodelicately that these shoes never quite disengage the driving` member,and the result is a steadiness of revolution of the shaft a impossiblein those gov? erning devices which operate by constantly coupling anduneoupling the driving member and the driven shaft. I

Having thus described my invention,I claim as new and desire to secureby Letters Patent- 1. In a friction driving and speed-regulat ingdevice, in combination, -a rotary driving member, a driven shaft, a hubon said shaft upon the periphery of which said driving member is looselycarried, a plate secured to said hub, movable plates carried by saidfirst plate, friction-shoes carried by said movable plates, adapted toengage said driving member, shafts adapted upon a rocking movement inone direction to move said movable plates and shoesv away from saiddriving member, angular levers, carried by said shafts, weighted upontheir outer ends, and spring-operated upon their inner ends, and aspring' for operating said levers in one direction.

2. In a friction driving and speed-regulating device, in combination, arotary driving member, a driven shaft, a hub on said shaft upon theperiphery of which said driving niember is loosely carried, a platehaving a hollow hub, secured to said [irst hub, movable plates carriedby said iirst plate, friction-shoes car ried by said movable platesadapted to engage said driving member, shafts adapted upon a rockingmovement in one direction to move said movable plates and friction-shoesinto contact with and upon a rocking movement in the other direction tomove said plates and shoes out of contact with said drivingmembei-,angular levers, carried by said shafts, weighted upon one endand engaging at the other end a sliding block within the hollow hub ofthe first plate, said block, a spring bearing against said block, and ascrew-plug carried by said hub whereby the tension of said spring may beadjusted.

CHARLES L. WTIHCHELT. llfitnesses:

GEORGE XV. SELTZEP., CHARLES A. BUTTER.

